Piston for air guns



June 11, 1940, c. F. LEFEVER PISTON FOR AIR GUNS Filed Dec. 1 9, 1938 H I INVENTOR .CHARLES F. LEFEVER IV BY ATTORNEYS Patented June 11,19 Q j I H UNITED STA S PATENT].,JOFF-IICE 2,204,370 r s'ron FOR. AIR GUNS Charles F. Lefever, Plymouth, Mich., assignor to Daisy Manufacturing Company, Plymouth,

Mich, a corporation of Michigan Application December 1 9,1938, Serial No. 246,71

. 5 Claims. (o1. 124-11 The invention relates to pistons more particu-' larly designed for use in air guns. andit is the object of the invention to obtain a construction which facilitates and expedites manufacture of the, same, In the present state of the artair guns are usually provided with an air cylinder in which the air is compressed by the movement of a piston actuated by a spring. Forward move- ,ment of the piston is arrested by an abutment while the air'is discharged from the cylinder through the medium of a tube projecting for-1 ward from the piston and extending through an aperture in said abutment. This tube also performs a mechanical function of impinging against the projectile to. positively actuate the same, while the compressed air causes an acceleration during further movement through the gun barrel.

In the manufacture of pistons of this type it has been customary to forma metallic core member headed at one end and on which the leather Washer or other packing material is sleeved. The air tube has its inner end engaging an axial recess in this core member, and is usually secured thereto by soldering. It is one of the objects of my invention to avoid this soldering operation,

A is the core member of the piston'which may be formed of round bar stock and a head or flange B is formed at the end of the core by an upsetting operation. C is the air tubewhich also is upset at one end to form a fianged'head D.

These parts are then secured to each other by a sheet metal stamping E centrally vaperturecl to engage the tube C with a recess F for receiving the head D and with a series of peripheral axially: extending prongs G. The latter are adapted to embrace the head flange B of the core member and to be clinchedoverthe same, thereby securely attaching the tube to the core. To admit I air into the tube a laterally opening port H is formed just beyond the point of engagement with the stamping E. The member A is also formed with a transversely extending bore I for receiving the pin by which the piston is attached to its 1' operating shank.- This shank J and also the piscurely attached to each other.

'ton -packin g 'K are shown in dottedlines in Figure 1. I

The construction as above described can be manufactured at lowcost inasmuch as the elements are formed by simple mechanical operations, such asstamping and upsetting. While the assembly of these elements. is accomplished more expeditiously than where a soldering oper- I ation is required, the parts are also more se- -In the modified construction shown in Figure 3 the stamping E is dispensed with and the head portion B of the core member A is recessed to receive a disk L sleeved on the tube C. The peripheral portion of the disk is beveled and the annular flange B surrounding the recess is pressed inward to engagethe same.

What I claim as my invention is:

1. In a piston for air guns, a solidcylindrical core member radially outwardly flanged atits forward end, an aligned air tube radially out: Wardly flanged at its rear end, and a coupling member surrounding said air'tube and engaging the flange thereof havinga clinching engagement with the flange of saidcore member.

- 2. In a piston for air guns, a solid cylindrical 'core member having an upset radially outwardly extendingflange at its forward end, an aligned 1 air tube having an upset radially outwardly extending flange at its rear end in'contact with said core member, and a coupling member surrounding said air tubeladjacent to the flange thereof having a clinching engagement with the flange of said core member.

3. In a piston for air guns, at solidcylindrical core member having a. peripheral flange at its forwardvend, an aligned air tube havingian up-' set flange. at its rear end contactingsald core member, and a coupling formed of a sheet metal stamping surrounding said airtube and clinched about the flange of said core member.

\ 4. In a piston for air guns, a solid cylindrical core member having an upset-peripheral; flange at its forward end, an aligned air tubehaving an upset peripheral flange 'at its rear end in contact with said core member, and a coupling formed of a sheet metal stamping having a portion surrounding said tube and engaging the flange thereof, and a portion clinched about the flangeof said core member.

5. In a piston for air guns, a cylindrical core member recessed at its forward end to form an annular .flangeand having a. portion of smaller diameter in rear of said recessed portion, an air tube having an upset flange at its rear end, a disk surrounding said air tube and fitting within said recess, said annular flange being closed over the periphery of said disk to retain the same.

CHARLES F. LEFEV'ER. 

